Merge pull request #26 from macbookandrew/release/1.10.0

release 1.10.0

- Add YouTube Terms of Service and Google Privacy Policy

- Prevent undefined index error

- Fix deployment

- Fix undefined index error when no upcoming videos are available

- Prevent any errors from showing up when debug mode is disabled

- Fix “undefined index” issue in debug logs

- Fix persistent update notice

- Escape admin-visible debug output

- Escape oembed output

- Update code documentation

- Update plugin branding images